Micrometer



A. F. DONALDSON.

MICRONIETER.

APPLICATION FILED IAN. 26. 1917.

1,346,304. Patented July 13, 1920.

IYIIIIIIIIIIIIIII IllIlllllllIllIlIlllllilllllllllllllllll INI/'ENTER AUGUSTUS F DONALDSON UNITED STATES Parent crains.

AUGUSTUS F. DONALDSON, 0F TOLEDO, OHIO, ASSIGNOEL TO THE BUNTING i"llASS & BRONZE COMPANY, OF TOLEDO, Ofi-ITO, A CORPORATION OF OHIO.

MICROMETER.-

Application filed January 26, 1917.

To all fio/wm Macy concern.'

'Ailosom a citizen of the United States, and

a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain newand useful Micrometer; and I do hereby declare the following to be a full, clear, and enact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accom panying drawings, and to the characters ot reference marked thereon, which form a part of this speciiication My invention relates to micrometric indicators.

It has for its object to provide an indicator whichv will indicate micrometrically the measurements of bodies. It particularly has for its object to indica-te the measurements of bodies in so clear and ocular a way that bodies `may be measured rapidly and by inexperienced operators. 'it also has for its object to provide a means which will indicate miercmetrical variations from a standard measurement.

The invention may be contained in many 'lorms ot construction for calipering and micronietrically measuring bodies or devices of different forms, all ot which come within the purview of my claims hereinafter appended. To show the practicability of my invention I have selected one of such constructions as an example and shall describe it hereinafter. The construction selected is illustrated in the. accompanying drawings, wherein,-

Figure 1 is a top view of the device having an adjustable head removed for purn poses of illustration. F ig. 2 is a. longitudinal sectional view oi the device, and Fig. is a top view .of the device, though in measurements somewhat reduced from those which are shown in Figs. 1 and 2.

1, Fig. 1, is a supporting base on which the parts are mounted. On one end of the base is located a bracket 2 which may be formed from a part of the base. A large part of the base is covered by a housing 3, which may be secured to the base in any suitable manner. A bell crank lever 4 is supported between ears 5 of the bracket `2 by adjustable pins having countersunk recesses which coact with the pointed pin 7 to form a bearing-tor the lever 4f. The pins Specification of Letters Patenti.

Patented July 13, 1920.

serial no. 144,584.

6 may be secured in their adjusted positions by Vmeans ot screws 8 located in the ears 5. The bell cranklever 4 extends into the housing 3. The end of the bell crank lever 4l located within the housing is provided with a slot 9 in which is located a pin 10 secured in a lever 11. The lever 11 is supportedV in an adjustable bearing. In the iiorm ot' the invention shown the lever 11 is supported on a lever or arm 12 Fig. 2 which is pivoted between a pair of lugs or ears 13 formed on the base 1. The lever or arm 12 is provided with a. pair of ears 14; in which are located a pair of pins 15 having countersunk recesses which receive the ends ot' the pin 16 and coact therewith to form a supporting bearing for the lever 11. The pins 15 aresecured in their ad justed positions by 'means of screws 17. The position of the lever 12 may be ad justed by meansof the screw 18 which is threaded into the top ot the casing 3 and presses against the outerend of the lever 12. A spring 19 located in a socket formed in the lower side of the lever 12 and intermedia-te the end of the lever 12 and the base 1, operates to yieldingly press the lever 12 against the screw 18. By this Ameans the fulcrum or bearing of the lever 11 may be readily raised or lowered without affecting the length of the arm ot the lever 4 and without ali'ecting the length of the arm of the lever 11. The lever 11 has a downwardly extending` portion 2O which is lo cated at its outer end. The portion 2O is located in proximity to the base 1 and may be used to operate as a stop tov limit `the downward movement of the lever 411 caused by the weight ot its arm and by the weight of the arm of the lever 4, which is connected to the lever 11 through the pin 10. The lever 11 is provided with a slot 21 in which is located a pin 22. The pin 22 is secured in a disk 23. The disk'28 is secured to a shaft or pin 24k. The pin 24 is provided with pointed bearings which are supported in recesses located in pins 25. The pins 25 are supported in ears 26 l'ormed on the base 1. The pins 25 may be adjustably secured in position by means of the screws 27. A pointer 28 is yconnected to the disk 23.' In the form of the invention shown this con nection is made through a disk 29 in which the pointer 28 is secured, and the disk 29 is secured to the pin 24, which is connected to the Vdisk 23.'` By this means the pointer 23 is Vmoved by the operation ofthe lever ll upon the pin 22 whichis secured in the disk 23. By'this arrangement movements of the lever 4 are greatly magnified,` and VeX- act measurements oi variations may be ob-V tained therethrough when the vparts are properly adjusted and connected.' The lever ll supported on the fulcrum located on thelever l2 provides a means for exact adjustment. with reference to any delinite or ristandard measurement without varying the lengths .of the arms ofthe levers, and yet .connections are provided vbetween the levers, which eliminateall loose play, inas- Vmuch as the pins accurately tit the slots to connect the :rotatable members together. IThe leverll, which extends toward the iiulcrum of the lever 4 from the end of the lever' 4, positions the pointer 23 in proximity to the work of the operator, that-is, it brings the indicator in close proximity to the device or object `measured by the m1- crometer. Y

' The Ashort arm of the bell crank lever 4 Vis preferably provided with a head portion provide a clamping means tor rigidly lool*-Y ing the rod 33 in position. 'The bracket 35 may also bepi'ovided with a key located inthe channel for preventing rotation oit the head 32 andthe rod 33 in shifting the rod 33 in the bracket 35 to adjust it with reference to the head 30 of the lever 4. The rod 33 is clamped in position in thebracket by means of the screw 36, which extends' through the split portions of the bracket 35. ,The head 32 ischanneled, the channel 37 rbeing formed Vin the head 32on the side of thehead 32which opposes the headV 30 of the lever ,4. This provides a two point contact against l which the body may be pressed in order to locate it transversely with respect to a lineV connecting the heads placed.

301 and 32, for if thel body is placed angularly between the heads 3() and 32 the meas.- urement obtained will vary according to the angularity of the position in which Vit is whichare thus formed by the channel 3'? on the head 32 Vare located in lines which are perpendicular to the base l.

Intermediate. and beneath the heads 30 and'32'is located a plate 33 vwhich is supportedparallel 'with the base by means of a The two edges or contact surfaces# 'proximate sizeof the article to be measured,

and when the `article is inserted on the plate 33 and between the heads 30 and 32, micro metric measurements are indicated by the pointer 23. rlhe edges 3l of the lever 4 and oit the adjustable member y32 form lines 'of Contact on opposite'sides of the cylindricalV objects that are perpendicular to the plate 33. The parallel relation between the plate 33 and the base l, and the right angular relation between-the edges 3l and the edges or ridges4l oi the head'32 to the plate 33 result in measurements which are certain and yet which are micrometric in character,

and yet so ocular that the measurements oi'lv a great many objects having substantially the same size maybe rapidly made. The rod 33 may be provided with a scale 42 and, if desired, standard measurements may be obtained within the Vlimitations` ol' the scale by`shifting the scale through the bracket until the desired division of 'the Vscaleis located at the side ot the bracket or with in the plane oit the side ot' the bracket. Likewise the rod 39 which supports the plate may be providedjwith a scale 43 whereby the positionof the plate33 may be readily adjusted 'with reference to any adjustment of the rod 33. lnlasmuch, how ever, as the edges 3l and 41 are at right angles to the plane of the platev 33, the plate 33y may `be varied greatly without altering the measurements indicated by the pointer 23. raised to a point when cylindrical bodies are to be measured, sothat the horizontal diameterv of `the cylindrical body will, when extended, pass through aline or niark 44 which is Yformed on the head 30. The pointer 23extends tothe top of an arcuate housing '45 formed on the top of the housing 3. The .housing 45 is provided with a slot 4G through which the pointer 23 may extend.,f

A scale 47 is located beside the slot 46 to in# dicate therelative extentV oi movements oi the pointer 23. rllhe scale-47- will thus act asi exceedingly fine divisions of the scale 42 locatedon the rod 33, and the pointer will' micrcmetrically the scale 42.'

If desired, the headv 32 may be located so as to standardize the instrument with lreference to any particular article, that is,'the

indicate subdivisions of The rodV 39 is secured in its adV Preferably, however, themplate 33 is lll) lli

neaeoa head 32 may be placed in a delinite posi cylindrical bodies. are to be measured andY so that by reason of the position of the headV 32 to the head 30 the pointer 28 Will be located at a center point or division of the scale 4:7. `When this has been done variations in measurement of similar articles from the standard may thus be readily detected.- Articles ot similar character may thus be rapidly slipped in and out between the heads 30 and' 32, and their accuracy readily determined by unskilled operators. r)This results in a great saving in ca-lipering cylirdrical bodies, as it requires a skilled artisan to correctly manipulate calipers, alloiv for spring of calipers, etc. Also, it results in a great saving because of the rapidity with which cylindrical bodies may be measured and brought Within the limits of requirements that may be placed on the accuracy oit measurements of such devices.

The construction described may be varied by those slrilled in the art, and equivalent parts or elements may be substituted in lieu of those described Without in any vvise varying from the spirit of the invention embodied in the construction described.

l claim:

l. ln a micrometer a supporting part, an adjustable member connected to the supporting part and having a pair ot vertical ridges, a plate having a broad plane horizontal. suri'ace located beneath the ridges i'or supporting cylindrical bodies having their axes extending in a direction at right angles to the said ridges, a lever pivotcd to the supporting part, one arm of the lever having an edge substautiiiilly parallel to the ridges and opposing the ridges and located o1, posite a point between the ridges, means connected to the lever tor pressing the said odge toward the said ridges to press the cylindrical bodies against the ridges by the pressure of' the edge on the cylindrical bodies, and means connected to the lever for indicating relative movements of the said edge.

2. ln a micrometer, a supporting part, a part connected to the supporting part and having a pair oi vertical ridges, a lever having a substantially vertical edge located in opposed relation to the said vertical ridges and j 'voted on the supporting part, means for yicldingly Vpressing the vertical edge toward the vertical ridges, a plate located beloiv the vertical edge and ridges for supporting an object so that the axis ot the object will be at right angles to the vertical edge and ridges, the said means operating to press the edge against a side of the object and the object against the ridges, and means tor .indicating the movements ot the lever.

8. ln a micrometer, the combination ot a supporting part, an adjustable member connected to the supporting part having a pair et vertical ridges, plate having a broad plane horizontal suri'zu-e located beneath the ridges and at right angles to the ridges for supporting cylindrical bodies, the airis of the cylindrical bodies extending in a direction at right angles to the said ridges, a bell crank lever pivoted below the plate, one arm having an edge normally substantially parallel tothe ridges and the other arm touting beneath the plate, means for pressing said edge toward said ridges and additional means connected to the lever for indicating relative movement ot' the lever. l

ln a micrometer the combination of a supporting base, a stationary member', a lever having on one end an edge normally parallel to an opposing surface of the member, a second lever operating by and extending 1from near the end of the lirst lever toward the said edge and a pointer operated by the second lever, a plate located on said base beloiv the said edge and the said member and substantially at right angles to the said edge and the said surface.

5. ln a micrometer, theV combination of an adjustable member, a lever having an edge normally parallelV to the opposing surlare of the adjestableV member', a second lever connected to and extending 'from near the end of the first lever toward the said edge, a pointer operated by the second lever, a third lever, the second lever pivoted on the third lever, and means for adjusting the third lever to adjust the second lever relative to the lirst lever.

6. ln a micrometer', the combination of an adjustable member, a le ier having an edge normally parallel to the opposing surface ot the adjustable member, a second lever connected to and extending vfrom near the end of the first lever toward the said edge, a pointer operated by the second lever, a third lever, the second lever pivoted on the third lever', a spring for raising one end oiI the third lever, and an adjustable stop t'or adjusting the position of the third lever to adjust the second lever relative to the first lever.

7. ln a micrometer, the combination of a n adjustable stationary member, a bell c 'anlr lever extending under the stationary meinber and having an edge normally substantially parallel to `an opposing suriace ot the adjustable member, a second lever connected to and extending `from near the end oi the Jdrst lever toward the said edge, a pointer operated by the second lever, a third lever, the second lever pivoted on the third lever, a spring Afor raising one end oi' the third lever, and an adjustable stop ttor adjusting the position ot the third lever to adjust the second lever relative to the rst lever.

8. In a micrometer, the combination oi a supporting base, a member having a pair of parallel ridges, a rod having a scaleconnected to the member, Leans for securing `*the rod in adjusted positions, a lever having an edge opposing theA ridges, a pointer operated .by the lever, an arcuate scale in Vproximity tothe pointer, the divisions of' the third scale corres )Ondine to the divisions of the first namedscale.

Q 'In a micrometer, the combination of a v supporting base, a member having a pair oil ridges, a rod connected to the member and having a scale, means for securing the'inember and rod in `adjusted positions, a bell crank vlever extending under the member and rod and having an edge normally located parallel to the ridges, a plate located in a plane at right angles to the ridges and edge and supportedV by a rod having a scale like the scale on the first named rod, means for securing the plate in adjusted positions, a second lever operated by the first lever and extending from near the endof the first lever toward the fulcruni of the first lever, a third lever for supporting the second lever, means for adjusting the third lever relative to the first lever, a pointei` operated by the second lever, and an arcuate scale located in proximity to the pointer-having rthe subdivisions ol the scale of the first named rodi' i l0. in a micrometer a supporting part, an adjustable member connected to the 'sup porting part and having a pair of vertical ridges, a plate having a broad plane horizontal surface located beneath the ridges and at right angles to the ridges for supporting cylindrical bodies having' their aries` extending in a' direction at right-angles to the said ridges, a lever. pivoted to the supporting part, one arni oic the lever having an edge substantialiy parallel to the ridgesy and op; posing the ridges and located opposite a point between the ridges, means .connected to the lever for pressing the said-edge toward the said ridges to press' the cylindrical bodies against the ridges by the pressure of theedge on Vthe cylindrical bodies, the upper ends oi" the ridges and edge terminating in parts that slope away from a point between the ridges onV one'Y side and the edge on the other.

In testimony whereof signed my name to this specification.

AUGUSTUS F. DGNALBSON.,

have hereunto 

